Registering instrument.



Patented Sept. 10, 1918.

R. F. SCHNEIDER.

REGISTERING INSTRUMENT.

APPLlcATloN FILED MAY 4. 1916.

/N EN 70H Q* AUHNEYS RALPH F. SCHNEIDER, or NEW rr rare sa YORK, N. Y.,ASSIGNOR T CHARLES J'. TAGLI-AB'UE, 0F BROOKLYN, YORK.

' FIC.

REGISTERING- INSTRUMENT.

Specication f Letters Batent.

Patentea selbe. io.' isis.

Application led May 4, 1916. Serial No. 95,301.

. the followingis a specification.

My invention relates to registering instru` ments and more particularlyyto that type thereof in which the registering mechanism is operated bya fluid actuated means. The purpose of my improvement is to prevent anoperation of said fluid actuated means beyond a predetermined point andto ob-- viate the danger sof injury thereto through an abnormalactuation thereof and to this end consists in providing a simple andefH- cient means whereby the actuating fiuid is automatically cut ofl'lfrom said member at a predetermined point and actuation thereof iscoincidentally arrested. My invention will be fully describedhereinafter and the features of novelty will be pointed out in the apended claims. 'l

n the accompanying drawings I have shown my .improvement operativelycoml direction by means o f a sector 11 in opera:

bined with a sphygmomanometer it being understood that this is only anexample used for illustrative purposes. In said drawings Figure v1 is anelevation of a sphygmomanometer-with parts broken away andin sectionincluding my improvement; Fig. 2 is an enlarged detail view partly'insection; and Fig. 3 is a sectional View on the line 3-3 of Fig. 2. V 'lThe registering instrument or more specifically the sphygmomanometer maybe of any well known and usual construction comprising for instance thecasing 5 having a dial 6 in its front face provided with suitableindications 7 in the customary manner.

The instrument further includes an indicator' hand 8 adapted'to coperatewith said indications and carried by a shaft 9, journaled on a frame 10and whichis rotatedin one Ktive enga ement with a pinion on the shaft 9which eing a well known arrangement has not been shown in detail. 'Theshaft 9 in the illustrated example comprises anl expansible chamber ormember 15 constructed in thecustomary manner and connected in any wellknown way, for instance as shown in Fig. 2, with a neck or connection 16which is located eXteriorly of the casing 5 and preferably terminates ina screw-threaded end 17 adapted to removably receive the nipple 18. Thesaid lneck or connection 16 is formed with an axial passa e 19communicating with the interior o the chamber or member 15 as shown inFig, 2 and normally also communicating with the fieXible tube 20 whichis detachably connected with the nipple 18 and which leads to the sourceofthe actuating fluid.

As shown in the drawings my improvement comprises a stem 21 which isrigidly connected with the end wall-of the chamber or member 15 to movetherewith and which projects from the interior surface thereof throughsaid 'chamber or member 15 and extends through the axial assage 19 'fthe neck or connection 16 and Eeyond the end thereof as shown in Figs. 1and 2. The projecting end of said stem 21 is preferably screw-threadedas at 22 to receive the internally screw-threaded nut or projection 23'which may be provided with an 'annular knurled surface 24 forfacilitating the rotation thereof. In the preferred construction one ormore washers 25 are located on the stem 21 between the projection or nut23 and the end face of the neck or connection 16 and eitherindependently mounted on said stem 21 or connected with the nut 23 tomove therewith as desired.

the member or chamber 15 whereby the latter is caused to expand. Thisexpansion of said member or chamber 15 carries with it the` whereby theefticiency'and accuracy` of theI instrument is destroyed or interferedwith. It has heretofore been attempted to overcome this danger invarious ways as for instance by causing the closed movable end of saidmember or chamber 15 to engage with a stationary stop. As such stomerely limits the expansive movement of t e chamber or member 15, acontinued forcing or pumping in of the air will simply cause saidchamber or member 15 to expand in -directions other than its normaldirection of movement or at points other than the point where resistanceto the normal. expansive movement is offered by the stationary stop. Theobjections above noted are thus not satisfactorily or efficientlyovercome with j such constructions.

With the present arrangement as the chamber or member 15 isexpanded thestem 21 will be carried along and will be drawn lengthwise of the axialpassage 19 until finally the washer or washers 25 backed up by the nutor projection 23 are brought into engagement with the end face'of theneck or connection 16. AAs soon as this happens the expansive movementof said chamber or member 15 is not only arrested but the end of thepassage 19 is sealed by the washer 25 -so that the admission of any moreactuating iuidl to the chamber or member 15 is cut olf and prevented: Itis thus impossible to i further iniate. the member 15 and as the ut 23may be adjusted on the stem 21 this result may be brought about'at anypoint and at all times Within the expansive L,limit for which theparticulachamber or member 15 is constructed. Even if the washer orwashers 25 are omitted and the nut 23 alone 1s relled upon to simplyarrest the expansive -movement'. of the member 15, the moment said nut23 engages the end of the coniection 16 a resistance to the incomingair'will be effected to forcibly indicate to the operator that the limitof intended'actuati'on of saidmember 15 has been reached. The stem 21 bybeing secured to the end surface of the member 15 and in combinationwith the nut 23 and connection l-also rigidly secures the said member 15against distortion even if said nut 23 alone is used merely as a stop toarrest'therexpansivermovement of said member 15. In the preferredarrangement, however, I prefer to include the Washers 25 or theirequivalent so that, in addition to arresting the actuation of the member15, the admission of any additional atuating fluid thereto is preventedand cut o By adjusting the nut 23 on the stem 21 the point at which thearresting of the expansion of said fluid actuated means and the cuttingofi' of the actuating medium thereto, takes place may be varied so thatnumerous and various results may be obtained n a simple and eiiicientmanner. It will be noted that the nipple 18 surrounds and incloses theprojecting portion of the stem 21 and the washers 25 and nut 23 so thatthese elements are protected against tampering, after 'the desiredadjustment thereof has been had. To change the adjustment the' nipple18. is removed by means of a suitable tool from the screw-threaded endl17 of the connection 16 whereby the nut 23 is brought into readyaccessibility as will be apparent.

My improvement is simple in construction and eil'ective in operation andmay be eiciently combined with numerous types of registering instrumentsother than sphygmomanometers and' which include a fluid actuated meansfor operating the recording or indicating mechanism. v

While I have shown and described my improvementin combination with aregistering instrument, it will be obvious that the same may, .withequal eiliciency, be operatively combined with recording and otherinstruments in which a permanent record is made.

Various changes in the specific form shown and described may be madewithin the scope of the claims without departing from the spirit of myinvention.

I claim:

1. 'The combination of registering mechanism, a hollow, fluid actuated,expansible member for operating said mechanism, a tubular neckcommunicating with the interior of said member and adapted forconnection with a source dfuid supply, a stem carried by saidmember andmovable therewith, said stem extending through and beyond said tubularneck, and a valve adjustably mounted upon the projecting end of saidstem so as to beaccessible,l from the terior of said member and adaptedfor con- Lemmi .f

nection with a 'source of Huid supply, a of said neck whereby theexpansion of said stem carried by said member and movable member isarrested and a nipple detachably therewith, said stem extending throughand connected with, said tubular neck and incos-v 1o beyond said tubularneck, means adjustably ing said means.

mounted upon the projecting end of said In testimony whereof, l havehereunto stem so as to be accessible from the exterior set my hand.

of said neck, said means engaging the end RALPH F. SCHNEXDER.

